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Positive Electrode Active Material for Lithium Battery

a lithium battery and active material technology, applied in the direction of magnetic paints, cell components, magnetic bodies, etc., can solve the problems of difficult to obtain output, achieve the effect of preventing short circuits (voltage drops), increasing output characteristics, and difficult to obtain output characteristics

Active Publication Date: 2012-01-19
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]Consequently, the present invention provides a novel positive electrode active material for lithium battery in which the filling density (tap density) can be increased, at the same time, the output characteristics can be increased, and furthermore, the voltage decrease during high temperature charge conservation is small.Means to Solve the Problems
[0018]Compared to a spinel type lithium transition metal oxide that does not contain a boron compound, the positive electrode active material for lithium battery of the present invention becomes compact micro-particles as a result of sintering of micro-particles being promoted, allowing the filling density (tap density) to be increased along with allowing the discharge capacity at high-load discharge (3 C) to be increased. In addition, when a boron compound is added and a spinel type lithium transition metal oxide is fired, since sintering is promoted leading to specific surface areas becoming small, in general, output characteristics become difficult to obtain; however, in the case of the present invention, by defining the inter-atomic distance Li—O to a predetermined range, the entering / exiting of Li ions are facilitated, allowing the output characteristics to be increased.
[0019]In addition, defining the amount of magnetic substance detected by a predetermined measurement method can render micro-short-circuits (voltage drops) unlikely to occur. In particular, it is possible to prevent short circuits (voltage drops) in a state of being maintained at a high temperature for a long time period still in a charged state.

Problems solved by technology

However, as described above, if generation and growth of crystals are promoted by adding boron (B) or the like when firing a spinel type lithium transition metal oxide (LMO), micro-particles (also referred to “primary particle”) crystal particles have aggregated become large, such that, while it is possible to increase the filling density (tap density), there is the problem that the output becomes more difficult to obtain.

Method used

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  • Positive Electrode Active Material for Lithium Battery
  • Positive Electrode Active Material for Lithium Battery
  • Positive Electrode Active Material for Lithium Battery

Examples

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examples

[0116]In the following, the present invention will be described further based on examples; however, the present invention is not to be limited to the examples indicated below.

[0117]For the samples (powders), the inter-atomic distances Li—O and Mn—O and the crystallite size were measured by the Rietveld method using the fundamental method described in the following.

[0118]The Rietveld method using the fundamental method is a method whereby the structural parameters of a crystal are refined from the diffraction intensities obtained by powder x-ray diffraction or the like. It is a method in which a crystal structure model is hypothesized, and various parameters of this crystal structure are refined in such a way that the x-ray diffraction pattern derived by calculations from this structure matches as much as possible the actually measured x-ray diffraction pattern.

[0119]An x-ray diffractometer (D8 ADVANCE, manufactured by Bruker AXS) using a Cu-Kα beam was used for the measurements of x...

examples 1-4

[0155]Magnetic force sorting (“raw material magnetic separation” in Table 1) to electrolytic manganese dioxide (contains 0.03 percent in mass Mg; TG diminution amount during 200° C.-400° C. heating: 3.0%) was carried out as indicated in Table 1, whereby using the magnetic force sorter described below which the ratio of the surface area of the magnet with respect to the magnetic force sorting distance in the up / down direction is adjusted to fall in the range of 800 mm2 / mm to 900 mm2 / mm, and introducing manganese raw material at an introduction speed of 1.0 kg / min.

[0156]So as to obtain the composition indicated in Table 1, lithium carbonate, electrolytic manganese dioxide, magnesium oxide and aluminum hydroxide, furthermore, with respect to the total weight thereof, 0.4 percent in weight of lithium borate (Li2B4O7) and water were mixed and stirred to prepare slurry with a solid content concentration of 25 percent in weight.

[0157]To the obtained slurry (10 kg raw material powder), an a...

example 5

[0166]Magnetic force sorting of electrolytic manganese dioxide (contains 0.03 percent in mass Mg; TG diminution amount during 200° C.-400° C. heating: 3.0%) was not carried out.

[0167]So as to obtain the composition indicated in Table 1, lithium carbonate, electrolytic manganese dioxide, magnesium oxide and aluminum hydroxide, furthermore, with respect to the total weight thereof, 0.4 percent in weight of lithium borate (Li2B4O7) and water were mixed and stirred to prepare a slurry with a solid content concentration of 25 percent in weight.

[0168]Thereafter, a sample was obtained similarly to Example 3.

[0169]When the obtained sample was analyzed by ICP by removing impurities such as SO4, it was determined that the composition was that shown in Table 1. The boron content was 0.1 percent in weight of the sample. In addition, the inter-atomic distance Li—O (“Li—O”), the crystallite size and the amount of magnetic substance of the obtained sample are indicated in Table 1, at the same time...

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Abstract

With the object of providing a positive electrode active material for lithium battery that can increase the filling density, can increase the output characteristics, and furthermore, with a small voltage decrease during conservation at high temperature in a charged state, a positive electrode active material for lithium battery is proposed, containing a spinel type (Fd3-m) lithium transition metal oxide represented by general formula Li1+xM2-xO4-δ (where M represents a transition metal including Mn, Al and Mg, x represents 0.01 to 0.08 and 0≦δ) and a boron compound, the inter-the atomic distance Li—O of the spinel type lithium transition metal oxide being 1.971 Å to 2.006 Å, and the amount of magnetic substance measured for the positive electrode active material for lithium battery being 600 ppb or less.

Description

TECHNICAL FIELD[0001]The present invention is related to a positive electrode active material for lithium battery, which can be used as a positive electrode active material for a lithium battery, and which, in particular, can be used suitably as a positive electrode active material of a battery that equips an electric tool called a power tool, an electric vehicle (EV: Electric Vehicle), a hybrid electric vehicle (HEV: Hybrid Electric Vehicle) or the like.TECHNICAL BACKGROUND[0002]Lithium batteries, in particular lithium secondary batteries, having such characteristics as a large energy density and a long life span, are used widely as power sources for home appliances such as video cameras and portable electronic devices such as notebook personal computers and mobile phones, electric tools such as power tools, and the like, and recently have been put into application in large batteries that equip an electric vehicle (EV), a hybrid electric vehicle (HEV) and the like.[0003]A lithium s...

Claims

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Application Information

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IPC IPC(8): H01M4/50
CPCC01G45/1242H01M4/405C01P2002/52C01P2002/76C01P2002/77C01P2002/78C01P2004/03C01P2004/51C01P2004/62C01P2006/11C01P2006/12C01P2006/40C01P2006/80H01M4/485H01M4/505H01M10/052Y02E60/122Y02T10/7011H01M4/131H01M4/1391H01M4/40C01P2002/32Y02E60/10C01G45/00H01M4/36
Inventor KAGEI, SHINYAMIYANOHARA, KEISUKEHATA, YOSHIMIOCHI, YASUHIROSASAKI, KENJI
Owner MITSUI MINING & SMELTING CO LTD
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